Edmund Morris, who wrote an acclaimed biography of Theodore Roosevelt but is best known for his life of Ronald Reagan, in which the author inserted himself as a fictional narrator, a device that baffled and angered some historians, died on Friday in Danbury, Conn. He was 78. His death, at a hospital following a stroke on Thursday, was confirmed on Monday by his wife, the author Sylvia Jukes Morris. He lived in Kent, Conn. Mr. Morris’s “The Rise of Theodore Roosevelt” won a Pulitzer Prize and a National Book Award in 1980. He followed that with two other well-received books...